(ew) In addition, the outlet ports shall be
insect-proof and consideration shall be given to all exposures in the immediate
vicinity including windows or locations where gas can enter confined
Acceptable methods for complying with
(1) Lock the stop valve in the open position.
Instruct authorized personnel of the importance of not inadvertently leaving
the stop valve closed and of being present during the entire period that the
stop valve is closed so that they can lock it in the open position before they
leave the location.
duplicate relief valves, each having adequate capacity by itself to protect the
system and arrange the isolating valves or 3-way valve so that mechanically it
is possible to render only one safety device inoperative at a time.
(iw) Precautions shall be taken to
prevent unauthorized operation of any valve which will make pressure limiting
devices inoperative. This provision applies to isolating valves, by-pass
valves, and valves on control or float lines which are located between the
pressure limiting device and the system which the device protects. A method
similar to s. PSC 135.199(2) (hw), shall be considered acceptable in complying
with this provision.
Wis. Admin. Code Public Service
CR Register, October,
1999, No. 526, eff. 11-1-99; correction in (2) (iw) made under s. 13.93(2m) (b)
7, Stats., Register February 2004, No.